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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am facing some kind of issues when I am trying to ping a specific host from my Red Hat machine.If I ping a some different subnet, it works just fine. Let say I have 3 hosts-A,B,C.
Ex:-From host A to B:-
ping 10.164.253.216
PING 10.164.253.216 (10.164.253.216) 56(84) bytes of data.
From 192.168.68.10 icmp_seq=1 Packet filtered
From 192.168.68.10 icmp_seq=2 Packet filtered
From 192.168.68.10 icmp_seq=3 Packet filtered

Some sites don't allow you to ping them - it is, as I understand it, a defence against DoS attacks. There is a site www.example.com which is set up specifically to be pinged (it's part of the icann/iana consortium so should be safe) run:

Code:

ping www.exampe.com

If that works, your computer's fine but the server your pinging is shirty about it.